Acts 16:6-10 (NIV):
6 Paul and his companions traveled throughout the region of Phrygia and Galatia, having been kept by the Holy Spirit from preaching the word in the province of Asia. 7 When they came to the border of Mysia, they tried to enter Bithynia, but the Spirit of Jesus would not allow them to. 8 So they passed by Mysia and went down to Troas. 9 During the night Paul had a vision of a man of Macedonia standing and begging him, “Come over to Macedonia and help us.” 10 After Paul had seen the vision, we got ready at once to leave for Macedonia, concluding that God had called us to preach the gospel to them.
How often do Christian missionaries go to preach to specific countries or places in God's timing, when the Holy Spirit allows them to, when God explicitly leads them to do so? Is this a common practice among missionaries? Does the answer depend on the specific denomination of the missionaries?